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Finding the Fourth Proportional to 18,687.80, 28,031.64 and 12,826.64

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Solution

The fourth proportional to 18,687.80, 28,031.64 and 12,826.64 is: 19,239.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.80 : 28,031.64 = 12,826.64 : x
  2. Step 2: Convert to fraction form
    18,687.80/28,031.64 = 12,826.64/x
  3. Step 3: Cross multiply
    18,687.80x = 28,031.64 × 12,826.64
  4. Step 4: Simplify right side
    18,687.80x = 359,551,754.89
  5. Step 5: Solve for x
    x = 359,551,754.89/18,687.80
  6. Step 6: Final answer
    x = 19,239.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.